Inability to adjust or inspect a valve due to design and breakage of OE ratcheting end plug.
Sonnax adjustment tool allows line pressure to be tuned without damaging the ratcheting end plug.
Sonnax adjustment tool 119940-TL9 is designed to tune line pressure in VW 096, 097, 098, 01M, 01N and 01P units without breaking the end plug by compressing the ratcheting arms of an OE or Sonnax end plug. Turning the adjuster clockwise increases booster pressure, line pressure and creates firmer engagements as well as upshifts and downshifts. Turning the adjuster counter clockwise reduces line pressure at idle and results in softer shifts.